PC Joystinck with more than 4 buttons

[Daniele - Skrauso]

HI all,
I'm reversing the circuit of a 8-button pc joypad. I read on the web that
the native joystick interface on audiocards supports 4 buttons and 4
potentiometers directly connected to the port. Now.. does anyone know how it
is possible to implement 8 buttons? On my actual circuit there are some nand
gates (used to get the turbo funcions on some buttons) and some 3-pins smd
components I suppose are transistors. The joypad is contolled by a generic
8-buttons driver under windows. Is there a sort of time-multiplexed access
for 8 buttons recognzed by the driver?


Thanx

Daniele

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[Si Ballenger]

On Sun, 2 May 2004 13:21:49 +0200, "Daniele - Skrauso"
<re_di_picche@infinito.it> wrote:

HI all,
I'm reversing the circuit of a 8-button pc joypad. I read on the web that
the native joystick interface on audiocards supports 4 buttons and 4
potentiometers directly connected to the port. Now.. does anyone know how it
is possible to implement 8 buttons? On my actual circuit there are some nand
gates (used to get the turbo funcions on some buttons) and some 3-pins smd
components I suppose are transistors. The joypad is contolled by a generic
8-buttons driver under windows. Is there a sort of time-multiplexed access
for 8 buttons recognzed by the driver?

Go to ebay and search for usb gameport to see a 4 port setup.
These have been used for digital input to a pc. Should be able to
get 16 buttons from this gizmo.